\begin{table}[htbp]\centering
\def\sym#1{\ifmmode^{#1}\else\(^{#1}\)\fi}
\caption{HC staff knowledge index -- Subcomponents}
\begin{tabular}{l*{3}{c}}
\toprule
                    &\multicolumn{1}{c}{(1)}&\multicolumn{1}{c}{(2)}&\multicolumn{1}{c}{(3)}\\
                    &\multicolumn{1}{c}{\textbf{\begin{tabular}[c]{@{}c@{}}HC staff\\knowledge\\index\end{tabular}}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}\# of patients\\rights correctly\\named\end{tabular}}&\multicolumn{1}{c}{\begin{tabular}[c]{@{}c@{}}\# of patients\\resp. correctly\\named\end{tabular}}\\
\midrule
Full treatment      &       0.171   &       0.222   &       0.128   \\
                    &     (0.121)   &     (0.139)   &     (0.151)   \\
Constant            &      -0.016   &      -0.019   &      -0.013   \\
                    &     (0.080)   &     (0.095)   &     (0.093)   \\
\midrule
N                   &         187   &         187   &         187   \\
R$^{2}$             &       0.276   &       0.290   &       0.211   \\
Adjusted p-value (FT)&       0.473   &       0.223   &       0.397   \\
\bottomrule
\end{tabular}
\end{table}
